What are some important functions and commands in PHP, besides the ones mentioned in the thread?

Issue: Besides the functions and commands mentioned in the thread, there are several other important functions and commands in PHP that are commonly used for various tasks. Some of these include array functions like array_push(), array_pop(), array_merge(), string functions like strlen(), substr(), strtoupper(), date and time functions like date(), time(), strtotime(), file handling functions like fopen(), fwrite(), fclose(), and database functions like mysqli_connect(), mysqli_query(), mysqli_fetch_assoc(). Code snippet: 

// Example of using array functions in PHP
$myArray = [1, 2, 3];
array_push($myArray, 4);
echo implode(", ", $myArray); // Output: 1, 2, 3, 4

// Example of using string functions in PHP
$string = "Hello, World!";
echo strlen($string); // Output: 13
echo strtoupper($string); // Output: HELLO, WORLD!

// Example of using date and time functions in PHP
echo date("Y-m-d H:i:s"); // Output: current date and time
echo strtotime("next Monday"); // Output: timestamp for next Monday

// Example of using file handling functions in PHP
$myfile = fopen("example.txt", "w");
fwrite($myfile, "Hello, PHP!");
fclose($myfile);

// Example of using database functions in PHP
$connection = mysqli_connect("localhost", "username", "password", "database");
$query = "SELECT * FROM users";
$result = mysqli_query($connection, $query);
$row = mysqli_fetch_assoc($result);

Keywords

PHP functions commands libraries error types important.

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